<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    li {
      width: 300px;
      height: 30px;
      background-color: rgb(127, 78, 78);
      margin-top: 10px;
    }
  </style>
</head>

<body>
  <div id="app">
    <button @click="createMsg">创建一个msg</button>
    <div v-if="isShow">
      <button @click="changeMsg">修改这个msg</button>
      {{msg}}
    </div>
  </div>
  <script src="./vue.global.js"></script>
  <script>
    const { createApp } = Vue;
    const app = createApp({
      data() {
        return {
          isShow: false
        }
      },
      methods: {
        createMsg() {
          this.msg = '这是我动态创建的';
          this.isShow = true
        },
        changeMsg() {
          this.msg = '值修改了'
          console.log(this.msg);
          // this.$forceUpdate();
        }
      }
    })
    app.mount('#app')
  </script>
</body>

</html>